ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction is reversible
2. BThe reaction needs a catalyst
3. CThe reaction is very fast
4. DThe reaction releases heat

What does the octet rule state?

1. AEvery stable atom has exactly 8 protons in its nucleus
2. BAtoms tend to gain, lose or share electrons to get 8 outer electrons
3. CEvery stable molecule contains exactly 8 atoms
4. DAn atom can form a maximum of 8 covalent bonds

เลขอะตอมของธาตุบอกอะไร

1. Aจำนวนโปรตอนในแต่ละอะตอม
2. Bจำนวนนิวตรอนในแต่ละอะตอม
3. Cจำนวนรวมของโปรตอนและนิวตรอนในนิวเคลียส
4. Dจำนวนอะตอมในธาตุหนึ่งโมล

What are London dispersion forces?

1. AStrong bonds formed by transferring electrons
2. BForces that hold protons together in the nucleus
3. CAttractions between a hydrogen atom and a metal ion
4. DWeak, temporary attractions caused by shifting electrons in molecules

Which measurement has three significant figures?

1. A0.00560
2. B56
3. C0.0056
4. D5.0006

How many grams are in 2.5 kg?

1. A2500 g
2. B250 g
3. C25 g
4. D0.0025 g

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. ASand, because it has a higher specific heat capacity than water
2. BWater, because it has a higher specific heat capacity than sand
3. CBoth warm equally, because they absorbed the same heat
4. DSand, because it has a lower specific heat capacity than water

Alkanes follow the general formula CₙH₂ₙ₊₂. What is the formula of the alkane with 4 carbon atoms?

1. AC₄H₁₂
2. BC₄H₁₀
3. CC₄H₆
4. DC₄H₈